* {
    margin: 0;
    padding: 0;
    list-style: none;
    text-decoration: none;
    outline: none;
    color: #000;
    /* 直接调用就行 */
}

body {
    overflow-x: hidden;
}

.container {
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

.flex {
    display: flex;
    margin: 0;
    padding: 0;
    list-style: none;
}

.flex-wrap {
    display: flex;
    flex-wrap: wrap;
    /* align-content: space-between; */
    align-content: flex-start;
}

.f-c {
    flex-direction: column;
}

.j-s {
    justify-content: flex-start;
}

.j-e {
    justify-content: flex-end;
}

.j-c {
    justify-content: center;
}

.j-sb {
    justify-content: space-between;
}

.j-sa {
    justify-content: space-around;
}

.j-se {
    justify-content: space-evenly;
}

.a-s {
    align-items: flex-start;
}

.a-e {
    align-items: flex-end;
}

.a-c {
    align-items: center;
}